EP80579 Datasheet, PDF (1731/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
47.2.2
DDR2 Frequencies Supported by the EP80579
Supported DDR2 frequencies are based on the SKU and the Tolapai operating
frequency. Table 47-2 lists the supported DDR2 frequencies. The supported frequencies
are defined as frequency blocks. The DDR2 interface is defined as a function of the
SKUs shown in Table 47-1, “Base Features of EP80579 SKUs”.
Table 47-2. IA-32 Core Internal Bus and DDR2 Frequencies
IA-32 Core [MHz]
1,200
1,066
600
Internal Quad Pump FSB [MHz]
533
533
400
DDR2 Supported Frequencies (MHz)
400, 533, 667, 800
400, 533, 667, 800
400, 533, 667
47.2.3
Strap Options (Platform-based Configuration)
The Tolapai provides an external pull-down strap pin (V_SEL) that allows the platform
to select IA-32 core frequency. The value of V_SEL determines the operating point
(frequency and voltage) of the IA-32 core in conjunction with the value of the Tolapai
output pin, BSEL.
BSEL is derived from the IA-32 core BSEL output and indicates the fixed FSB frequency.
The V_SEL pin is driven by the Tolapai to a default value corresponding to the SKU
shown in Table 47-1, “Base Features of EP80579 SKUs” on page 1730, but may be
strapped low by the platform to override the SKU value; this causes the IA-32 core to
operate at the lowest gear ratio (multiplier applied to the FSB frequency to obtain the
IA-32 core frequency) and voltage combination corresponding to the SKU’s FSB
frequency. Table 47-3 shows the Tolapai strap options:
Table 47-3. Tolapai Strap Options
SKU ID
Manufacturing
Frequency SKU
(FSB/Intel
Architecture MHz)
BSEL
Value¹
V_SEL
Value
Operating
Frequency
(FSB/IA-32 Core
MHz)
IA-32 Core
Voltage
533/1200
5/6
533/1200
1
1
533/1200
1
0
533/1066
1.30V
1.30V
3/4/7
533/1066
1
0
533/1066
1.30V
--
--
0
1
Reserved
--
1/2/8
400/600
0
0
400/600
1.0V
Notes:
1.
The BSEL output to the clock generator on the board assumes that ‘0’ indicates 400 MHz FSB and '1’
indicates 533 MHz FSB.
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
1731